Motion-transmission mechanism



1,616,369 1.. c. HARTMANN MOTION TRANSMISSION MECHANISM Feb. 1 1927,

Filed Jan. '2. 1926 WITNESSES INVENTOR ludwgwn M BY ATTORNEYS Patented Feb. '1, 1927.

UNITED STATES LUDWIG CARL HARTMANN, or ELMHURST, NEW YORK.

MOTION-TRANSMISSION MECHANISM. 2

Application filed .ianuary This invention relates to mechanisms that are used for transferring rotary motion from a high speed driving shaft to a means to be driven at a uniform reduced speed which 5 may be varied and for imparting rotational movement in different directions.

The principal object of the invention'is to provide an improved, efficient and effectual mechanism of the indicated character which may be utilized for imparting dif ferential motion in different kinds of machinery or in conjunction with automobile engines and the like.

The nature of the invention and its distinguishing features and advantages will appear when the following specification is read in connection with the accompanying drawing, in which Figure 1 is a plan view showing one use of the mechanism of the present invention, the same being shown as connected to the driving road wheels of a vehicle for impartin g motion thereto.

Fig. 2 is a sectional elevation of the speed reducing means and certain connected parts of the mechanism;

Fig. 3 is asectional view taken substantially on the line 33 of Fig. 2 and looking in the direction indicated by the arrows. Generally stated the present invention in volves in combination a drive shaft 10, speed reducing means 11 operated by the drive shaft 10, a transmission or driven shaft 12 which is rotated through and by virtue of the means 11, driven shafts 13 and 14, means 15 for establishing and disestablishing connection between the transmission shaft 12 and said shafts 13 and 14, control means 16 for controlling the operation of the speed reducing means 11, and speed changlng means 17 for changing the speed of the transmission shaft 12. I The speed reducing means 11 in the present embodiment comprises a cam disk 18, bevel gear 19, a second multiple gear 20, and a universal connect-ion 21 between the gear 19 and the shaft 12. The disk 18 is provided with anti-friction rollers 22, the said rollers being arranged concentrically at one side of the disk, and said disk is keyed fast to the drive shaft 10. The bevel gear 19 has teeth 23 on one sidethereof to present a beveled gear, and the opposite face of said gear is provided with a circular groove 24 arranged concentrically with 7,1926. Serial No. 79,803.

respect to the axis of said gear. Thegear supported for rotation and rocking motion by virtue of the connection 21 which comprises a ball 27 'integral with the shaft 12 and radial pins 28 on the ball which are capable of being disposed respectively in the branch recesses 26. When the gear 19 is in place the rollers 22 will be disposed so as to travel in the groove'24 toimpart rocking movement to the. gear 19, in response to the rotation. of the drive shaft 10. The second gear 20 is loosely mounted on the shaft 12 adjacent the gear 19'and said gear 20 is provided with teeth 29 which are of a greater number than the number .of teeth 23 of the gear 19. The teeth 23 and 29 are adapted to set up a camming action due to the fact that there are more teeth on one gear than there is on the other gear, and as a result motion Wlll be transmitted from one gear to the other aecording'to 30 for a purposeto appear. The means 15 in the present instance includes agear 31 which is loosely keyed on the shaft 12 for sliding movement andis provided with teeth 32 and 33. The gear 31 is slidv by a suitable lever having a yoke 34, the pins 35 of which engage in an annular groove 36 in the gear 31. The means 15 also includes a gear 37 keyed to the shaft 13, a gear 38, and a gear 39 keyed. to the shaft 14. The gear 38 meshes with the gear 39, and the teeth 32 and .33 of the gear 31 are adapted to mesh respectively with the teeth of the gears 37 and 38 when the gear 31 is shifted to its active position. Suitable bearings areprovided in supports 40 for rotatably supporting the drive shaft 10 in axial alignmentwith the transmission shaft 12. One end of each of the shafts 13 and 14 is mounted in suitable bearings. The gear 38 is rotatable on a suitable shaft carried by one of the supports 40. As shown in Fig. 1 of the drawing the shafts 13 and 14 are connected respectively to the axles of road wheels 41 and 42 by the intervention of flexible shaftconnections 43 and 44. It will now be apparent that when the drive shaft 10 is rotated motion will be transmitted to the disk 18, to the gear. 19 by virtue of the rollers 22, the movement transi mitted to the gear 19 being a rocking moveinent,'and by virtue of the coaction of the teeth of the gears 19 and rotary moveii'ientvvill be also iinparted to the gear .19 Which Will be transferred to the shaft 12 by VVlien the gear 20 is free the caniming act-ion mentioned is set up eventhough the gear 20 ispermitted to'move, Whereas when the gear 20 isheld, the gear 19 iscaused to rotate in an opposite d;rction. The means 16 for controlling the'operation of the means 11, iii/the present instance includes a brake drum 45 on the gear 20 and a'brake band 16 which encircles the drum t5, the

hand being manipulated in any preferred manner to set :up the ecessary-braking action to hold the "gearQO against rotation.

T he means 17 'for changing the speed iratie between the" shaft 10 andl the driven shafts '13'and 1% comprises a shaft 47 mounted in suitable bearings, a Cl11Ve ,C01111eCtlQD 48'betweeii theshaft 10 and shaft 47, a clutch 49 betvieenthe shaft 457 and a gear 50 mounted for rotation on a stub shaft 51 carried 1 byone of the supports 40. :Theteeth of the ear -50meshes Withthe teeth 30 0f the gear 50; By manipulatiiig the clutch49 it ispos sible totransfer motion from the shaft '10 to the :gear 20, and this motion ill be im parted by virtue -of theooact-ioii of the teeth tothe. gears 19 andQO to the shaft12 through the gear 19 at a "ehanged'speed; i

From are foregoing it lwill'be imme that there has been described "a mechanisnr for transinitting'in'otion from the drivecshaft 10 to the driven shafts 1'3 and 14 at'a reduced speed, that t-hefsp'eed of rotation of the shafts 13 and 14 may hefvaried, that the shafts 1'3 and l'tare rotated in opposite diregents, thattlie rotation of the shafts 13 and 14maybereversed, andthat by shifting the gear 31 to aninactive position motion "will not be transmitted to th'e shaftsil3 and *14.

said driving shaft.

I claim: 7 V 1. Speed reduc ng and motion transmission mechanism comprising a driving shaft,

a transn ission shaft, a disk secured to the driving shaft, bevel gear, means between the transmission shaft and the bevel gear "alloiviiigsaid bevel gear to rock and'causing said transmission shaft to turn With said bevel gear, a second "gear'loosely mountedjon said transmission,shaft, said gears being juxtaposed with respect to each other sol'thae the teeth of the gears coact, the second'gear 1 having more teeth tlianthe bevel gear, means for holding said second gear against rotation, and means hetweensaid disk, and one face of said bevel gear causing the bevel gear to rock in response to the rotation of' said driving shaft. 7

2. Speed redueingand motion transmission mechanism comprising a driving shaft, a transmission shaft, a disk secured to the driving shaft, a bevel gear, means b tween the transmission shaft aiidfthe bevel gear allowing said bevel gearv to rock and ea'iismg said transmission shaft to .tiirn with said bevel gear, a second gear loosely 'moiinted on said transmission shaft, said ge .rs being juxtaposed vith'respect toeach'otlier so I that theteeth of the gears'coaet, the'second gear having .n ore teeth than the bevel gear,

means for holding sai d'se cond gear rotation, and means on said disk acting on one face of.v said bevel gear causing- "he bevel gear to rock n response to the rotation of 3'. Speed reduc ng and motioiiftraiis-ini'ssion mechanism comprising a driving shaft,

\. rL j i a transmiss on shaft, a disk secured to the driving'shaft, a bevel gear, :ine'aiis' betiveeh the transmission shaft and the flievel-gear alloiving said bevel gearto nick sndeaasiiig said transmission shaft to rare "With said bevel gear, a second gear loois elymouiited on said transmi sion shaft, said gearsbeinzg juxtaposed Withfrespect to "each/other "so that the teeth of the gears coaet-,,the. seeond gearhavingmore teeth than the beve igear,

"means for holding said second gear against rotation, and rollers .on'said'idisk acting on said bevel gear causing the bevel igea-r to rock in response to the rotation of said driving'shaft. .7 .7, V k a LUDWIG CARL HARTMANN. 

